_product_descriptionARRI’s M18 HMI Lamp Head With ALF/DMX Ballast Kit (Multi-voltage) is an open-face, lensless, more efficient lamp head built to work with a new power class of lamp–the 1800W SE HMI. The M18 combines the best aspects of a PAR and a Fresnel, creating diverging rays of light to produce a very crisp shadow. Provides the light output of a traditional 2.5K Par !!!!